a^2-b^2-(a+b) ^2
Factorize it
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a² - b² - ( a + b )²
using ( x + y )² = x² + y² + 2xy
a² - b²- { a² + b² + 2ab }
a² - b² - a² - b² - 2ab
-2b² - 2ab
- 2b ( b + a )
( -2b ) ( b + a )
using ( x + y )² = x² + y² + 2xy
a² - b²- { a² + b² + 2ab }
a² - b² - a² - b² - 2ab
-2b² - 2ab
- 2b ( b + a )
( -2b ) ( b + a )
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